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Pirelli PCB: failed attempt at tracing out the 4 under-SIM test points
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 19 Apr 2013 21:31:47 +0000
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All PCB trace connections to the USB connector are made on the outer layer
on the battery/SIM side of the PCB; none on the display/keypad side or on any
of the inner layers.

The L1 copper image from steve-m shows that the ID pin appears to be totally
unconnected.  The GND, VBUS and data pair connections appear the way one would
expect.